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pcnet: fix rx buffer overflow(CVE-2015-7512)
Backends could provide a packet whose length is greater than buffer size. Check for this and truncate the packet to avoid rx buffer overflow in this case. Cc: Prasad J Pandit <firstname.lastname@example.org> Cc: email@example.com Reviewed-by: Michael S. Tsirkin <firstname.lastname@example.org> Signed-off-by: Jason Wang <email@example.com>
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